136
Okay why is your distro the best?
(reddthat.com)
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
I just want to learn more about what are the differences between distros, so that they will be better or worse? Are all the distros having the same GNU/Linux kernel so that if I replace all the Arch userland files into Debian's, the system will become Debian?
Yes. Different distros have different versions, patches and so on, but the underlying kernel is the same.
If by "userland" you mean files which your normal non-root user can touch, then no. There's differences on how distributions build directory trees, file locations, binaries, versions and so on. You can of course replace all the files on the system and change distribution that way, a convenient way to do that is to use distros installer but technically speaking you can also replace them manually by hand (which I don't recommend).